Acetylene-gas burner.



PATENTED APR. 1'7, 1906.

J. B. CARROLL.

ACETYLBNE GAS BURNER.

APPLIGATLON FILED JUNE 22, 1905.

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JOHN B. CARROLL, OF CHICAGO, ILLINOIS.

ACETYLENE-GAS BURNER.

Application filed June 22,1905. Serial No. 266,475.

To all whom, it mln/lf concern.-

Be it known that I, Jol-1N B. CARROLL, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Acetylene-Gas Burners, of which the following is a specification.

Then a `iet of acetylene gas is projected from a small opening directly into the atmosphere and burned as it escapes, the opening.

soon becomes clogged with a solid deposit. This deposit may be either carbon or solid polymers or dissociation products of acetylene, or both. The fact that the deposit forms and accumulates is evidence that the walls of the opening are at a temperature below that at which the carbon or solid hydrocarbons oxidize or burn in the presence of air. To overcome this difficulty, it is usual to provide the burner with lateral inlets, through which cold air is entrained by the jet of gas issuing from a smallorifice. The gas is thus kept below the ignition-point until it is discharged from the burner, and the walls of the gas-orifice being remote from the point of combustion do not become heated to the temperature which will dissociate or polymerize the gas. It has also been proposed to cool the orifice below the gas-ignition point by a lateral stream of compressed air or by making the burner of a massive piece of metal to furnish an open path of escape for the heat radiated from the flame and by forming a basin in the end of the metal burner to cause an inrush of cold air to the gas at its point of escape.

The present invention is based on a diametrically opposite principle from that of the specified prior art. The burner is constructed of refractory heat-insulating material, In the face of this burner and in axial alinement with the gas-orifice is a recessed flame chamber and shield, preferably cylindrical in form and with a flat bottom. This chamber is connected to the gas-supply conduit by a short duct, so that the gas'is at once delivered directly into the chamber, where it burns as a central jet of flame at some distance from the surrounding wall and apparently with its base at or near the orifice. The wall retains the heat, and its inner surface is raised to and maintained at a high temperature. The air between this hot surface and the flame is thus highly heated and moves inward toward the orifice, thereby supplying hot air to the llame and maintain- Specification of Letters Patent.

Patented April 17', 1906.

ing at the orilice a temperature above that which permits the accumulation of carbon or solid hydrocarbons. The surrounding wall also sh'ields the flame and protects it from drafts. The amount and temperature of the air thus supplied to the orifice is determined by the width and depth of the flame-chamber, which should bear a certain relation to each other and to the pressure of the gas. The recess is of such width that the flame does not come in contact with its sides, and its depth must be such as not to unduly shade the flame and between upper and lower limits which cause accumulation of carbon at the orifice. If the surrounding wall of the recess is removed or pierced with holes which will permit an inrush of cold air, the Allame remains unchanged in shape and appearance, but the orifice soonchokes.

Referring to the accompanying drawings, Figure 1 is a perspective view of a burner, and Fig. 2 is a transverse vertical section in a plane passing through the axes pf the flamechambers.

The burner chosen for illustration is one of the duplex type, having two branches l l, leading from a trunk 2, which is supported in the upper end of ametal tube 3. The branches l and trunk 2 preferably consist or a single piece of lava, steatite, or other heat-insulating material, although the branches may consist of separate pieces of such material. In the inner face of each branch is a recessed flame-chamber 4, Which is preferably cylinindrical and has a flat bottom 5. Within each branch is a gas-supply'conduit 6, leading from a central passage 7. A minute cylindrical duct 8 extends from the conduit to the flame-chamber, the duct and chamber being in axial alinement. For general use, with a gas-pressure equal to two and one-half inches of Water, the recess may have a depth of twelve-hundredths of an inch and a Width of eighteen-hundredths of an inch.

In use the gas escaping from the ducts burns as a small-central jet in each flamechamber, and the two flames impinging at right angles between the branches spread out into a broad thin flat flame. A stream of air continuously passes inward between the heated sides of each chamber and the central flame, being thereby raised to a higher temperature before it reaches the central duct. The gas escaping from the duct meets the hot air and springs into flame, the base of the flame being at or in such proximity t0 the IOO orifice that its walls are maintained at a temperature above that which will permit the deposition of carbon or will cause it to be at once oxidized by the heated air if deposited While the commercial burner vusually comprises two branches with opposed flamechambers, it will be understood that a burner having a single gas-outlet and flame-chamber giving a candle-like flame may be employed.

I claiml. An acetylene-gas burner, consistingof a body of refractory heat-insulating material, provided with a supply-conduit, a recessed flame-chamber of suiicient width to admit air to the base of the flame, and a duct extending from said conduit to said chamber, as set forth.

2. An acetylene-(ras burner, consisting of a body of refractoryQheat-insulating material, provided. with a supply-conduit, a cylindrical Vllame-chamber of sufficient width to admit air to the base of the flame, and a central duct extending from said conduit to said chamber, as set forth.

3. An acetylene-gas burner, consisting of a body of refractory heat-insulating material, provided with a supply-conduit, a cylindrical liame-chamber of sufficient width to admit air to the base of the flame, and a short centr al duct extending from said conduit to said chamber, as set forth.

4. An acetylene-gas burner, consisting of a body of refractory heat-insulating material, provided with a supply-conduit, a cylindrical ermee flame-chamber of sufficient width to admit air to the base of the flame, and a short duct extending from said conduit to said chamber, said duct and chamber being in axial alinement, as set forth.

5. An acetylene-gas burner, comprising tips of refractory heat-insulating material, two supply-conduits, two opposed recessed flame-chambers of sufficient width to admit air to the base ofthe flame, and ducts extending from said conduits to said chambers, as set rorth.

6. An acetylene-gas burner, comprising tips of refractory heat-insulating material, two supply-conduits, two opposed cylindrical lame-chambers of sufficient Width to admit air to the base of the liame, and short central ducts extending from said conduits to said chambers, as set forth.

7. A11 acetylene-gas burner, comprising tips of refractory heat-insulating material, two supplyeconduits, two opposed cylindrical flame-chambers of sufficient width to admit air to the base of the flame, and short ducts extending from said conduits to said cham bers, the corresponding ducts and chambers being in axial alinement, as set forth.

In testimony whereof I have signed this specification, in the presence of two subscribing witnesses, this 13th day ol June, 1905.

JOHN B. CARROLL.

/Vitnesses:

D. H. FLETCHER, CARRIE E. JORDAN. 

